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<p class="magick-description">The <a href="command-line-options.html#define">-define</a> command-line option adds specific global settings generally used to control coders and image processing operations.</p>

<p>This option creates one or more definitions for coders and decoders to use
while reading and writing image data.  Definitions are generally used to
control image file format coder modules, and image processing operations,
beyond what is provided by normal means.  Defined settings are listed in <a href="command-line-options.html#verbose">-verbose</a> information ("<code>info:</code>" output format) as "Artifacts". </p>

<p>If <var>value</var> is missing for a definition, an empty-valued
definition of a flag is created with that name. This used to control on/off
options.  Use <a href="command-line-options.html#define">-define keys</a> to remove definitions
previously created.  Use <a href="command-line-options.html#define">+define "*"</a> to remove all existing definitions.</p>

<p>The same 'artifact' settings can also be defined using the <a href="command-line-options.html#set">-set "option:<var>key</var>" "<var>value</var>"</a> option, which also allows the use of <a href="escape.html" >Format and Print Image Properties</a> in the defined value. </p>

<p>The <var>option</var> and <var>key</var> are case-independent (they are
converted to lowercase for use within the decoders) while the <var>value</var>
is case-dependent.</p>

<p>Such settings are global in scope, and affect all images and operations. </p>

<pre class="highlight"><code>magick bilevel.tif -define ps:imagemask eps3:stencil.ps
</code></pre>

<p>Set attributes of the image registry by prefixing the value with
<code>registry:</code>.  For example, to set a temporary path to put work files,
use:</p>

<pre class="highlight"><code>-define registry:temporary-path=/data/tmp
</code></pre>

<p>Here is a list of recognized defines:</p>


<div class="table-responsive" style="font-size:87.5% !important;">

<table class="table table-sm table-striped">
   <tr>
    <th align="center" colspan=2>Command-line Defines</th>
  </tr>

  <tr>
   <td colspan=2><p></p></td>
  </tr>

 <tr>
    <td>auto-threshold:verbose</td>
    <td>return derived threshold as the <code>auto-threshold:threshold</code> image property.</td>
  </tr>

  <tr>
    <td>colorspace:auto-grayscale=<var>on|off</var></td>
    <td>prevent automatic conversion to grayscale inside coders that support
    grayscale. This should be accompanied by -type truecolor. PNG and TIF do
    not need this define. With PNG, just use PNG24:image. With TIF, just use
    -type truecolor. JPG and PSD will need this define.</td>
  </tr>

   <tr>
    <td>compare:ssim-radius=<var>value</var></td>
     <td>Sets the structural similarity index radius.</td>
  </tr>

    <tr>
    <td>compare:ssim-sigma=<var>value</var></td>
     <td>Sets the structural similarity index sigma.</td>
  </tr>

    <tr>
    <td>compare:ssim-k1=<var>value</var></td>
     <td>Sets the structural similarity index k1 argument.</td>
  </tr>

    <tr>
    <td>compare:ssim-k2=<var>value</var></td>
     <td>Sets the structural similarity index k2 argument.</td>
  </tr>

 <tr>
    <td>complex:snr=<var>value</var></td>
    <td>Set the divide SNR constant <a href="command-line-options.html#complex">-complex</a>.</td>
  </tr>

  <tr>
    <td>compose:args=<var>arguments</var></td>
     <td>Sets certain compose argument values when using convert ... -compose ...
    -composite. See <a href="compose.html"
    >Image Composition</a>.</td>
  </tr>

  <tr>
    <td>compose:clip-to-self=<var>true|false</var></td>
    <td>Some <a href="command-line-options.html#compose" >-compose</a> methods can modify the 
    'destination' image outside the overlay area.  It is disabled by default.</td>
  </tr>

  <tr>
    <td>compose:clamp=<var>on|off</var></td>
    <td>Sets each pixel whose value is below zero to zero and any the pixel
    whose value is above the quantum range to the quantum range (e.g. 65535)
    otherwise the pixel value remains unchanged.  Define supported in
    ImageMagick 6.9.1-3 and above.</td>
  </tr>

  <tr>
    <td>connected-components:angle-threshold=<var>value</var></td>
    <td>Merges any region with equivalent ellipse angle smaller than 
    <var>value</var> into its surrounding region or largest neighbor.
    Supported in Imagemagick 7.0.9.24.</td>
  </tr>

  <tr>
    <td>connected-components:area-threshold=<var>value</var></td>
    <td>Merges any region with area smaller than <var>value</var> into its 
    surrounding region or largest neighbor.</td>
  </tr>

  <tr>
    <td>connected-components:background-id=<var>object-id</var></td>
    <td>Identifies which object is to be the background object.
    Supported in Imagemagick 7.0.9.21.</td>
  </tr>

  <tr>
    <td>connected-components:circularity-threshold=<var>value</var></td>
    <td>Merges any region with circularity smaller than <var>value</var> 
    into its surrounding region or largest neighbor. Circularity is 
    computed as 4*pi*area/perimeter^2.
    Supported in Imagemagick 7.0.9.24.</td>
  </tr>

  <tr>
    <td>connected-components:diameter-threshold=<var>value</var></td>
    <td>Merges any region with diameter smaller than <var>value</var> 
    into its surrounding region or largest neighbor. Diameter is 
    computed as sqrt(4*area/pi).
    Supported in Imagemagick 7.0.9.24.</td>
  </tr>

  <tr>
    <td>connected-components:eccentricity-threshold=<var>value</var></td>
    <td>Merges any region with equivalent ellipse eccentricity smaller 
    than <var>value</var> into its surrounding region or largest neighbor.
    Supported in Imagemagick 7.0.9.24.</td>
  </tr>

  <tr>
    <td>connected-components:exclude-header=<var>true</var></td>
    <td>List the objects without the header. 
    Supported in Imagemagick 7.0.9.21.</td>
  </tr>

  <tr>
    <td>connected-components:keep=<var>list-of-ids</var></td>
    <td>Comma and/or hyphenated list of id values to keep in the output.
    Supported in Imagemagick 6.9.3-0.</td>
  </tr>

   <tr>
    <td>connected-components:keep-colors=<var>red;green;blue</var></td>
    <td>Keeps objects identified by their color in a semicolon separated list.
    Supported in Imagemagick 6.9.3-0.</td>
  </tr>

   <tr>
    <td>connected-components:keep-top=<var>number-of-objects</var></td>
    <td>Keeps only the top number of objects by area.
    Supported in Imagemagick 7.0.9.21.</td>
  </tr>

  <tr>
    <td>connected-components:major-axis-threshold=<var>value</var></td>
    <td>Merges any region with equivalent ellipse major axis diameter smaller 
    than <var>value</var> into its surrounding region or largest neighbor.
    Supported in Imagemagick 7.0.9.24.</td>
  </tr>

 <tr>
    <td>connected-components:mean-color=<var>true</var></td>
    <td>Changes the output image from id values to mean color values. Supported
    in Imagemagick 6.9.2-8.</td>
  </tr>

  <tr>
    <td>connected-components:minor-axis-threshold=<var>value</var></td>
    <td>Merges any region with equivalent ellipse minor axis diameter smaller 
    than <var>value</var> into its surrounding region or largest neighbor.
    Supported in Imagemagick 7.0.9.24.</td>
  </tr>

  <tr>
    <td>connected-components:perimeter-threshold=<var>value</var></td>
    <td>Merges any region with perimeter smaller than <var>value</var> 
    into its surrounding region or largest neighbor.
    Supported in Imagemagick 7.0.9.24.</td>
  </tr>

  <tr>
    <td>connected-components:remove=<var>list-of-ids</var></td>
    <td>Comma and/or hyphenated list of id values to remove from the output.
     Supported in Imagemagick 6.9.2-9.</td>
  </tr>

   <tr>
    <td>connected-components:remove-colors=<var>red;green;blue</var></td>
    <td>Removes objects identified by their color in a semicolon separated list.
    Supported in Imagemagick 6.9.3-0.</td>
  </tr>

  <tr>
    <td>connected-components:verbose=<var>true</var></td>
    <td>Lists id, bounding box, centroid, area, mean color for each region.</td>
  </tr>

  <tr>
    <td>convolve:scale=<var>{kernel_scale}[!^] [,{origin_addition}] [%]</var></td>
     <td>Defines the kernel scaling. The special flag ! automatically scales to
    full dynamic range. The ! flag can be used in combination with a factor or
    percent. The factor or percent is then applied after the automatic scaling.
    An example is 50%!. This produces a result 50% darker than full dynamic
    range scaling. The ^ flag assures the kernel is 'zero-summing', for
    example when some values are positive and some are negative as in edge
    detection kernels. The origin addition adds that value to the center
    pixel of the kernel. This produces an effect that is like adding the image 	
    that many times to the result of the filtered image. The typical value
    is 1 so that the original image is added to the result of the convolution.
    The default is 0.</td>
  </tr>

  <tr>
    <td>deskew:auto-crop=<var>true</var></td>
    <td>auto crop the image after deskewing.</td>
  </tr>

  <tr>
    <td>delegate:bimodal=<var>true</var></td>
     <td>Specifies direct conversion from Postscript to PDF.</td>
  </tr>

  <tr>
    <td>distort:scale=<var>value</var></td>
    <td>Sets the output scaling factor for use with <a href="command-line-options.html#distort"
   >-distort</a>.</td>
  </tr>

  <tr>
    <td>distort:viewport=<var>WxH+X+Y</var></td>
    <td>Sets the viewport for use with <a href="command-line-options.html#distort">-distort</a>.</td>
  </tr>

  <tr>
    <td>dither:diffusion-amount=<var>X%</var></td>
    <td>Sets the amount of diffusion to use with Floyd-Steinberg diffusion</td>
  </tr>

  <tr>
    <td>filter:option=<var>value</var></td>
     <td>Set a filter option for use with <a href="command-line-options.html#resize">-resize</a>.
    See below for specific options.</td>
  </tr>

  <tr>
    <td>filter:b=<var>value</var></td>
     <td>Redefines the spline factor used for cubic filters such as Cubic, 
     Catrom, Mitchel, and Hermite, as well as the Parzen cubic windowing 
     function. If only one of the b or c values are defined, the other is 
     set so as to generate a 'Cubic-Keys' filter. The meaning of the b and c 
     values was defined in a research paper by Mitchell-Netravali.</td>
  </tr>

  <tr>
    <td>filter:blur=<var>factor</var></td>
     <td>Scale the X axis of the filter (and its window). Use > 1.0 for blurry 
     or < 1.0 for sharp. This should only be used with Gaussian and 
     Gaussian-like filters simple filters, or you may not get the 
     expected results.</td>
  </tr>

  <tr>
    <td>filter:c=<var>value</var></td>
     <td>Redefine the Keys alpha factor used for cubic filters such as Cubic, 
     Catrom, Mitchel, and Hermite, as well as the Parzen cubic windowing 
     function. If only one of the b or c values are defined, the other is 
     set so as to generate a 'Cubic-Keys' filter. The meaning of the b and c 
     values was defined in a research paper by Mitchell-Netravali.</td>
  </tr>

  <tr>
    <td>filter:kaiser-alpha=<var>value</var></td>
     <td>Sets the Kaiser window alpha value. When it is multiplied by 'PI', 
     it is equivalent to "kaiser-beta" and will override that setting. 
     It only affects the Kaiser windowing function and does not affect 
     any other attributes.</td>
  </tr>

   <tr>
    <td>filter:kaiser-beta=<var>value</var></td>
     <td>Sets the Kaiser window beta value. It only affects Kaiser windowing 
     function and does not affect any other attributes. Before ImageMagick 
     v6.7.6-10, this option was known as "filter:alpha" (an inheritance 
     from the very old "zoom" program). It was changed to bring the function 
     in line with more modern academic research usage and better assign it 
     be more definitive. The default value is 6.5</td>
  </tr>

 <tr>
    <td>filter:lobes=<var>count</var></td>
     <td>Sets the number of lobes to use for the Sinc/Bessel filter. 
     This is an alternate way of specifying the 'support' range of the filter, 
     that is designed to be more suited to windowed filters, especially when 
     used for image distorts.</td>
  </tr>

  <tr>
    <td>filter:sigma=<var>value</var></td>
     <td>Sets the 'sigma' value used to define the Gaussian filter. 
     The default sigma value is '0.5'. It only affects the Gaussian filter, 
     but does not shrink (but may enlarge) the filter's 'support'. 
     It can be used to generate very small blurs, but without the filter 
     'missing' pixels due to using a small support setting. 
     A larger value of '0.707' (a value of '1/sqrt(2)') is another 
     common setting.</td>
  </tr>

  <tr>
    <td>filter:support=<var>radius</var></td>
     <td>Sets the filter support radius. It defines how large the filter 
     should be and thus directly defines how slow the filtered resampling 
     process is. All filters have a default 'preferred' support size. 
     Some filters like Lagrange and windowed filters adjust themselves 
     depending on this value. With simple filters this value either does 
     nothing (but slow the resampling), or will clip the filter function 
     in a detrimental way.</td>
  </tr>

  <tr>
    <td>filter:verbose=<var>true</var></td>
     <td>This enables printing of information about the final internal 
     filter selection to standard output. This includes a commented header 
     on the filter settings being used and data allowing the filter weights 
     to be easily graphed. Note however that some filters are internally 
     defined in terms of other filters. The Lanczos filter, for example, 
     is defined in terms of a SincFast windowed SincFast filter, while 
     the Mitchell filter is defined as a general Cubic family filter 
     with specific 'B' and 'C' settings.</td>
  </tr>

  <tr>
    <td>filter:window=<var>filter_function</var></td>
     <td>The IIR (infinite impulse response) filters Sinc and Jinc are 
     windowed (brought down to zero over the defined support range) with 
     the given filter. This allows you to specify a filter function to be 
     used as a windowing function for these IIR filters. Many of the defined 
     filters are actually windowing functions for these IIR filters. A typical 
     choices is Box, (which effectively turns off the windowing function).</td>
  </tr>
  
  <tr>
    <td>filter:window-support=<var>radius</var></td>
     <td>This define scales the windowing function to this size. This causes 
     the windowing (or self-windowing Lagrange filter) to act is if the 
     support window is larger than what is actually supplied to the calling 
     operator. The filter, however, is still clipped to the true support 
     size that is provided. If unset, this will equal the normal filter 
     support size.</td>
  </tr>

  <tr>
    <td>fourier:normalize=<var>inverse</var></td>
    <td>Sets the location for the FFT/IFT normalization as use by
    <a href="command-line-options.html#fft">+-fft</a> and <a href="command-line-options.html#ift">+-ift</a>. The default is
    <var>forward</var>.</td>
  </tr>

  <tr>
    <td>h:format=<var>value</var></td>
     <td>Set the image encoding format use when writing a C-style header.
         <var>format</var> can be any output format supported by ImageMagick
         except for <var>h</var> and <var>magick</var>.  If this
         option is omitted, the default is <var>GIF</var> for PseudoClass
         images and <var>PNM</var> for DirectClass images.
    </td>
  </tr>

  <tr>
    <td>hough-lines:accumulator=true</td>
     <td>Returns the accumulator image in addition to the lines image.</td>
  </tr>

  <tr>
    <td>json:features</td>
   <td>includes features in verbose information.</td>
  </tr>

  <tr>
    <td>json:limit</td>
    <td> </td>
  </tr>

  <tr>
    <td>json:locate</td>
    <td> </td>
  </tr>

  <tr>
    <td>json:moments</td>
   <td>includes image moments in verbose information.</td>
  </tr>

   <tr>
    <td>kmeans:seed-colors=<var>color-list</var></td>
     <td>Initializes the colors, where color-list is a semicolon delimited 
     list of seed colors (e.g. red;sRGB(19,167,254);#00ffff)</td>
  </tr>

 <tr>
    <td>magick:format=<var>value</var></td>
     <td>Set the image encoding format use when writing a C-style header.
         This is the same as "h:format=format" described above.</td>
  </tr>

   <tr>
    <td>magnify:method=<var>value</var></td>
    <td>Specifies the method of pixel art magnification. The choices are: 
    eagle2X, eagle3X, eagle3XB, epb2X, fish2X, hq2X, scale2X (default), 
    scale3X, xbr2X</td>
  	</tr>

   <tr>
    <td>modulate:colorspace=<var>colorspace</var></td>
    <td>Specified the colorspace to use with <a href="command-line-options.html#modulate">-modulate</a>. 
    Any hue-based colorspace may be use. The default is HSL.</td>
  	</tr>

 <tr>
    <td>morphology:compose=<var>compose-method</var></td>
     <td>Specifies how to merge results generated by multiple<a
    href="defines.html#morphology" >-morphology</a> kernel. The default is none. One
    typical value is 'lighten' as used, for example, with the sobel edge
    kernels. </td>
  </tr>

  <tr>
    <td>morphology:showKernel=<var>1</var></td>
     <td>Outputs (to 'standard error') all the information about a generated <a
    href="defines.html#morphology" >-morphology</a> kernel.</td>
  </tr>

  <tr>
    <td>phash:colorspaces=<var>colorspace,colorspace,...</var></td>
    <td>The perceptual hash defaults to the sRGB and HCLp colorspaces.  When
    using this define, you can specify up to six alternative colorspaces. (as
    of IM 7.0.3-8)</td>
  </tr>

  <tr>
    <td>phash:normalize=<var>true</var></td>
    <td>Normalizes the phash metric by dividing by the number of channels
    specified by <code>-define phash:colorspaces</code> when using compare
    -metric phash. (as of IM 7.0.3-8)</td>
  </tr>

  <tr>
    <td>profile:skip=<var>name1,name2,...</var></td>
     <td>Skip the named profile[s] when reading the image. Use skip="*" to
    skip all named profiles in the image. Many named profiles exist,
    including ICC, EXIF, APP1, IPTC, XMP, and others.</td>
  </tr>

  <tr>
    <td>precision:highres-transform=<var>true</var></td>
     <td>Increases the profile transform precision. Note, there is a slight 
     performance penalty as the high-precision transform is floating point 
     rather than unsigned. It is important to note that results may depend 
     on whether or not the original image already has an included profile.</td>
  </tr>

  <tr>
    <td>preserve-timestamp=<var>true|false</var></td>
     <td>Preserve file timestamp (<code>mogrify</code> only).</td>
  </tr>

  <tr>
    <td>q-table=<var>quantization-table.xml</var></td>
     <td>Custom JPEG quantization tables.</td>
  </tr>

  <tr>
    <td>quantum:format=<var>type</var></td>
     <td>Set the type to <code>floating-point</code> to specify a floating-point
    format for raw files (e.g. GRAY:) or for MIFF and TIFF images in HDRI mode
    to preserve negative values. If <a href="command-line-options.html#depth">-depth</a> 16 is
    included, the result is a single precision floating point format.
    If <a href="command-line-options.html#depth">-depth</a> 32 is included, the result is
    double precision floating point format. For signed pixel data, use <code>-define quantum:format=signed</code></td>
  </tr>

   <tr>
    <td>quantum:maximum=<var>value</var></td>
     <td>Maximum value for certain image types such as DCM. If not set, the 
     the maximum value is QuantumRange.</td>
  </tr>

   <tr>
    <td>quantum:minimum=<var>value</var></td>
     <td>Minimum value for certain image types such as DCM. If not set, the 
     the minimum value is zero.</td>
  </tr>

 <tr>
    <td>quantum:polarity=<var>photometric-interpretation</var></td>
     <td>Set the photometric-interpretation of an image (typically for TIFF
     image file format) to either <code>min-is-black</code> (default) or
    <code>min-is-white</code>.</td>
  </tr>

  <tr>
    <td>registry:<var>attribute</var>=<var>value</var></td>
     <td>Sets attributes of the image registry, for example, 
     registry:temporary-path=/data/tmp.
    </td>
  </tr>

  <tr>
    <td>resample:verbose=<var>true</var></td>
     <td>Outputs the cylindrical filter lookup table created by the EWA 
     (Elliptical Weighted Average) resampling algorithm. Note this table 
     uses a squared radius lookup value. This is typically only used for 
     debugging EWA resampling.
    </td>
  </tr>

  <tr>
    <td>sample:offset=<var>geometry</var></td>
     <td>Location of the sampling point within the sub-region being sampled,
    expressed as percentages (see <a href="command-line-options.html#sample" >-sample</a>).</td>
  </tr>

   <tr>
    <td>shepards:power=<var>value</var></td>
     <td>Sets the exponent in the Shepard's distortion. The default is 2.</td>
  </tr>

<tr>
    <td>stream:buffer-size=<var>value</var></td>
   <td>Set the stream buffer size.  Select 0 for unbuffered I/O.</td>
  </tr>

 <tr>
    <td>trim:percent-background=<var>X%</var></td>
   <td>Sets the amount of background that is tolerated in an edge. It is 
   specified as a percent. 0% means no background is tolerated. 
   50% means an edge can contain up to 50% pixels that are background per 
   the fuzz-factor.</td>
  </tr>

  <tr>
    <td>type:features=<var>string</var></td>
    <td>Adds a font feature to be used by the RAQM delegate during complex 
    text layout. This is usually used to turn on optional font features that 
    are not enabled by default, but can be also used to turn off default font 
    features. Features include those to control kerning, ligature and Arabic.</td>
  </tr>

  <tr>
    <td>type:hinting=<var>false</var></td>
    <td>Disables font hinting. Proper glyph rendering needs the scaled points 
    to be aligned along the target device pixel grid, through an operation 
    often called hinting. One of its main purposes is to ensure that important 
    widths and heights are respected throughout the whole font. (For example, 
    it is very often desirable that the ‘I’ and the ‘T’ glyphs have their 
    central vertical line of the same pixel width. Hinting also manages 
    features like stems and overshoots, which can cause problems at small 
    pixel sizes.</td>
  </tr>

  <tr>
    <td>x:screen=<var>true</var></td>
    <td>Obtains the image from the root window.</td>
  </tr>

  <tr>
    <td>x:silent=<var>true</var></td>
    <td>Turns off the beep when importing an image.</td>
  </tr>


  <tr>
   <td colspan=2><p></p></td>
  </tr>

  <tr>
   <td colspan=2><p></p></td>
  </tr>

  <tr>
   <th align="center" colspan=2>IMAGE FORMATS</th>
  </tr>

  <tr>
   <td colspan=2><p></p></td>
  </tr>

  <tr>
    <td>bmp3:alpha=<var>true|false</var></td>
    <td>include any alpha channel when writing in the BMP image format.</td>
  </tr>

  <tr>
    <td>bmp:format=<var>value</var></td>
    <td> valid values are <var>bmp2</var>, <var>bmp3</var>,
   and <var>bmp4</var>.  This option can be useful when the
   method of prepending "BMP2:" to the output filename is inconvenient or
   is not available, such as when using the <a href="mogrify.html">mogrify</a>   utility.</td>
  </tr>

  <tr>
    <td>bmp:subtype=<var>value</var></td>
    <td>BMP channel depth subtypes. The choices are: RGB555, RGB565, ARGB4444, 
    ARGB1555. Only support in BMP (BMP4). BMP3 and BMP2 do not contain header 
    fields to support these options.</td>
  </tr>

  <tr>
    <td>dcm:display-range=<var>reset</var></td>
     <td>Sets the display range to the minimum and maximum pixel values for the
    DCM image format.</td>
  </tr>

  <tr>
    <td>dcm:rescale=<var>true</var></td>
     <td>Enable interpretation of the rescale slope and intercept settings 
     in the file.</td>
  </tr>

   <tr>
    <td>dcm:rescale=<var>true</var></td>
     <td>Enable interpretation of the rescale slope and intercept settings 
     in the file.</td>
  </tr>

    <tr>
    <td>dcm:window=<var>CxW</var></td>
     <td>Specifies the dcm window center and width.</td>
  </tr>

<tr>
    <td>dds:cluster-fit=<var>true|false</var></td>
     <td>Enables the dds cluster-fit.</td>
  </tr>

  <tr>
    <td>dds:compression=<var>dxt1|dxt5|none</var></td>
     <td>Sets the dds compression.</td>
  </tr>

  <tr>
    <td>dds:mipmaps=<var>value</var></td>
     <td>Sets the dds number of mipmaps.</td>
  </tr>

  <tr>
     <td>dds:weight-by-alpha=<var>true|false</var></td>
     <td>Enables the dds alpha weighting.</td>
  </tr>

  <tr>
    <td>dng:output-color=<var>value</var></td>
     <td>Select the output colorspace. The choices are: 
       0 - Raw color (unique to each camera), 
       1 - sRGB D65 (default), 
       2 - Adobe RGB (1998) D65, 
       3 - Wide Gamut RGB D65, 
       4 - Kodak ProPhoto RGB D65,  
       5 - XYZ, 
       6 - ACES</td>  
    </tr>

  <tr>
    <td>dng:use-auto-bright=<var>false</var></td>
     <td>Disables the histogram-based white level.</td>
  </tr>

 <tr>
    <td>dng:use-auto-wb=<var>true</var></td>
     <td>Computes the white balance by averaging the entire image.</td>
  </tr>

  <tr>
    <td>dng:use-camera-wb=<var>true</var></td>
     <td>Uses the white balance specified by the camera.</td>
  </tr>

  <tr>
    <td>dot:layout-engine=<var>value</var></td>
     <td>Specifies the layout engine for the DOT image format (e.g.
    <code>neato</code>).</td>
  </tr>

  <tr>
    <td>eps:use-cropbox=<var>true</var></td>
     <td>Forces Imagemagick to respect the crop box.</td>
  </tr>

  <tr>
    <td>exr:color-type=<var>value</var></td>
     <td>Specifies the color type for the EXR format: RGB, RGBA, YC, YCA, Y, 
     YA, R, G, B, A).</td>
  </tr>

  <tr>
    <td>fpx:view=<var>value</var></td>
     <td>Specifies the FlashPix viewing object, which contains the specification 
     of a viewing transform. The viewing transform enables applications to 
     represent a set of simple edits as a list of "commands" which are applied 
     to the image in real time without altering the original image.</td>
  </tr>

  <tr>
    <td>heic:preserve-orientation=<var>true</var></td>
    <td>Preserve the original EXIF orientation during HEIC decoding and rotate 
    the pixels accordingly. By default, EXIF orientation is reset to "1" to 
    match the actual orientation of pixels in HEIC.
    </td>
  </tr>

  <tr>
    <td>icon:auto-resize</td>
     <td>Automatically stores multiple sizes when writing an ico image
    (requires a 256x256 input image).</td>
  </tr>

  <tr>
    <td>jp2:layer-number=<var>value</var></td>
     <td>Sets the maximum number of quality layers to decode. Same for JPT, JC2,
    and J2K.</td>
  </tr>

  <tr>
    <td>jp2:number-resolutions=<var>value</var></td>
     <td>Sets the number of resolutions to encode.Same for JPT, JC2, and
     J2K.</td>
  </tr>

  <tr>
    <td>jp2:progression-order=<var>value</var></td>
     <td>Choose from LRCP, RLCP, RPCL, PCRL or CPRL. Same for JPT, JC2, and
    J2K.</td>
  </tr>

  <tr>
    <td>jp2:quality=<var>value,value...</var></td>
     <td>Sets the quality layer PSNR, given in dB. The order is from left to
    right in ascending order. The default is a single lossless quality layer.
    Same for JPT, JC2, and J2K.</td>
  </tr>

  <tr>
    <td>jp2:rate=<var>value</var></td>
     <td>Specify the compression factor to use while writing JPEG-2000 files.
     The compression factor is the reciprocal of the compression ratio. The
     valid range is 0.0 to 1.0, with 1.0 indicating lossless compression. If
     defined, this value overrides the -quality setting.  A quality setting
     of 75 results in a rate value of 0.06641. Same for JPT, JC2, and J2K.</td>
  </tr>

  <tr>
    <td>jp2:reduce-factor=<var>value</var></td>
     <td>Sets the number of highest resolution levels to be discarded.Same for
    JPT, JC2, and J2K.</td>
  </tr>

  <tr>
    <td>jpeg:block-smoothing=<var>on|off</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>jpeg:colors=<var>value</var></td>
     <td>Set the desired number of colors and let the JPEG encoder do the
    quantizing.</td>
  </tr>

  <tr>
    <td>jpeg:dct-method=<var>value</var></td>
     <td>Choose from <code>default</code>, <code>fastest</code>,
    <code>float</code>, <code>ifast</code>, and <code>islow</code>.</td>
  </tr>

  <tr>
    <td>jpeg:extent=<var>value</var></td>
     <td>Restrict the maximum JPEG file size, for example <code>-define
    jpeg:extent=400KB</code>.  The JPEG encoder will search for the highest
    compression quality level that results in an output file that does not
    exceed the value. The <code>-quality</code> option also will be respected
    starting with version 6.9.2-5. Between 6.9.1-0 and 6.9.2-4, add -quality
    100 in order for the jpeg:extent to work properly. Prior to 6.9.1-0, the
    -quality setting was ignored.</td>
  </tr>

  <tr>
    <td>jpeg:fancy-upsampling=<var>on|off</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>jpeg:optimize-coding=<var>on|off</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>jpeg:q-table=<var>table</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>jpeg:sampling-factor=<var>sampling-factor-string</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>jpeg:size=<var>geometry</var></td>
     <td>Set the size hint of a JPEG image, for
    example, <code>-define jpeg:size=128x128</code>.
    It is most useful for increasing performance and reducing the memory
    requirements when reducing the size of a large JPEG image.</td>
  </tr>

  <tr>
    <td>mng:need-cacheoff</td>
   <td>turn playback caching off for streaming MNG.</td>
  </tr>

  <tr>
    <td>pcl:fit-to-page=<var>true</var></td>
  </tr>

 <tr>
    <td>pdf:fit-page=<var>geometry</var></td>
     <td> geometry specifies the scaling dimensions for resizing when the PDF 
    is being read. The geometry is either WxH{%} or page size. No offsets are
    allowed. (introduced in IM 6.8.8-8)</td>
  </tr>

  <tr>
    <td>pdf:fit-to-page=<var>true</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>pdf:page-direction=<var>right-to-left</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>pdf:stop-on-error=<var>true</var></td>
    <td> </td>
  </tr>

   <tr>
    <td>pdf:thumbnail=<var>false</var></td>
     <td>Skips writing a thumbnail when saving a PDF file.</td>
  </tr>

  <tr>
    <td>pdf:use-cropbox=<var>true</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>pdf:use-trimbox=<var>true</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>png:bit-depth=<var>value</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>png:color-type=<var>value</var></td>
     <td>desired bit-depth and color-type for PNG output.  You can force the 
    PNG encoder to use a different bit-depth and color-type than it would have
    normally selected, but only if this does not cause any loss of image
    quality. Any attempt to reduce image quality is treated as an error and no
    PNG file is written.  E.g., if you have a 1-bit black-and-white image, you
    can use these "defines" to cause it to be written as an 8-bit grayscale,
    indexed, or even a 64-bit RGBA.  But if you have a 16-million color image,
    you cannot force it to be written as a grayscale or indexed PNG.  If you
    wish to do this, you must use the appropriate <a href="command-line-options.html#depth">-depth</a>,
    <a href="command-line-options.html#colors">-colors</a>, or <a href="command-line-options.html#type">-type</a> directives to
    reduce the image quality prior to using the PNG encoder. Note that in
    indexed PNG files, "bit-depth" refers to the number of bits per index,
    which can be 1, 2, 4, or 8.  In such files, the color samples always have
    8-bit depth.</td>
  </tr>

  <tr>
    <td>png:compression-filter=<var>value</var></td>
    <td> valid values are 0 through 9. 0-4 are the corresponding PNG filters,
   5 means adaptive filtering except for images with a colormap, 6 means
   adaptive filtering for all images, 7 means MNG "loco" compression, 8 means
   Z_RLE strategy with adaptive filtering, and 9 means Z_RLE strategy with no
   filtering.</td>
  </tr>

  <tr>
    <td>png:compression-level=<var>value</var></td>
    <td> valid values are 0 through 9, with 0 providing the least, but fastest
       compression and 9 usually providing the best and always the slowest.</td>
  </tr>

  <tr>
    <td>png:compression-strategy=<var>value</var></td>
    <td> valid values are 0 through 4, meaning default, filtered, huffman_only,
   rle, and fixed ZLIB compression strategy. If you are using an old zlib
   that does not support Z_RLE (before 1.2.0) or Z_FIXED (before 1.2.2.2),
   values 3 and 4, respectively, will use the zlib default strategy
   instead.</td>
  </tr>

  <tr>
    <td>png:format=<var>value</var></td>
    <td> valid values are <var>png8</var>, <var>png24</var>,
   <var>png32</var>, <var>png48</var>,
   <var>png64</var>, and <var>png00</var>.
   This property can be useful for specifying
   the specific PNG format to be used, when the usual method of prepending the
   format name to the output filename is inconvenient, such as when writing
   a PNG-encoded ICO file or when using <a href="mogrify.html">mogrify</a>.
   Value = <var>png8</var> reduces the number of colors to 256,
   only one of which may be fully transparent, if necessary.  The other
   values do not force any reduction of quality; it is an error to request
   a format that cannot represent the image data without loss (except that
   it is allowed to reduce the bit-depth from 16 to 8 for all formats).
   Value = <var>png24</var> and <var>png48</var>
   allow transparency, only if a single color is fully transparent and that
   color does not also appear in an opaque pixel; such transparency is
   written in a PNG <code>tRNS</code> chunk.
   Value = <var>png00</var> causes the image to inherit its
   color-type and bit-depth from the input image, if the input was also
   a PNG.</td>
  </tr>

  <tr>
    <td>png:exclude-chunk=<var>value</var></td>

  <tr>
    <td>png:include-chunk=<var>value</var></td>
     <td>ancillary chunks to be excluded from or included in PNG output.

    <p>The <var>value</var> can be the name of a PNG chunk-type such
    as <var>bKGD</var>, a comma-separated list of chunk-names
    (which can include the word <var>date</var>, the word
    <var>all</var>, or the word <var>none</var>).
    Although PNG chunk-names are case-dependent, you can use all lowercase
    names if you prefer.</p>

    <p>The "include-chunk" and "exclude-chunk" lists only affect the behavior
    of the PNG encoder and have no effect on the PNG decoder.</p>

    <p>As a special case, if the <code>sRGB</code> chunk is excluded and
    the <code>gAMA</code> chunk is included, the <code>gAMA</code> chunk will
    only be written if gamma is not 1/2.2, since most decoders assume
    sRGB and gamma=1/2.2 when no colorspace information is included in
    the PNG file.  Because the list is processed from left to right, you
    can achieve this with a single define:</p>

<pre class="highlight"><code>-define png:include-chunk=none,gAMA
</code></pre>

    <p>As a special case, if the <code>sRGB</code> chunk is not excluded and
    the PNG encoder recognizes that the image contains the sRGB ICC profile,
    the PNG encoder will write the <code>sRGB</code> chunk instead of the
    entire ICC profile.  To force the PNG encoder to write the sRGB
    profile as an <code>iCCP</code> chunk in the output PNG instead of the
    <code>sRGB</code> chunk, exclude the <code>sRGB</code> chunk.</p>

    <p>The critical PNG chunks <code>IHDR</code>, <code>PLTE</code>,
    <code>IDAT</code>, and <code>IEND</code> cannot be excluded.  Any such
    entries appearing in the list will be ignored.</p>

    <p>If the ancillary PNG <code>tRNS</code> chunk is excluded and the
    image has transparency, the PNG colortype is forced to be 4 or 6
    (GRAY_ALPHA or RGBA).  If the image is not transparent, then the
    <code>tRNS</code> chunk isn't written anyhow, and there is no effect
    on the PNG colortype of the output image.</p>

    <p>The <a href="command-line-options.html#strip">-strip</a> option does the equivalent of the
    following for PNG output:</p>

<pre class="highlight"><code>-define png:exclude-chunk=EXIF,iCCP,iTXt,sRGB,tEXt,zCCP,zTXt,date</code></pre>

    <p>The default behavior is to include all known PNG ancillary chunks
    plus ImageMagick's private <code>vpAg</code> ("virtual page") chunk,
    and to exclude all PNG chunks that are unknown to ImageMagick,
    regardless of their PNG "copy-safe" status as described in the
    PNG specification.</p>

    <p>Any chunk names that are not known to ImageMagick are ignored
    if they appear in either the "include-chunk" or "exclude-chunk" list.
    The ancillary chunks currently known to ImageMagick are
    <code>bKGD</code>, <code>cHRM</code>, <code>gAMA</code>, <code>iCCP</code>,
    <code>oFFs</code>, <code>pHYs</code>, <code>sRGB</code>, <code>tEXt</code>,
    <code>tRNS</code>, <code>vpAg</code>, and <code>zTXt</code>.</p>

    <p>You can also put <code>date</code> in the list to include or exclude
    the "Date:create" and "Date:modify" text chunks that ImageMagick normally
    inserts in the output PNG.</p></td>
  </tr>

  <tr>
    <td>png:ignore-crc[=<var>true</var>]</td>
     <td>When you know your image has no CRC or ADLER32 errors, this can speed 
     up decoding. It is also helpful in debugging bug reports from "fuzzers".</td>
  </tr>

  <tr>
    <td>png:preserve-colormap[=<var>true</var>]</td>
     <td>Use the existing image->colormap. Normally the PNG encoder will
    try to optimize the palette, eliminating unused entries and putting
    the transparent colors first.  If this flag is set, that behavior
    is suppressed.</td>
  </tr>

  <tr>
    <td>png:preserve-iCCP[=<var>true</var>]</td>
     <td>By default, the PNG decoder and encoder examine any ICC profile
    that is present, either from an <code>iCCP</code> chunk in the PNG
    input or supplied via an option, and if the profile is recognized
    to be the sRGB profile, converts it to the <code>sRGB</code> chunk.
    You can use <code>-define png:preserve-iCCP</code> to prevent
    this from happening; in such cases the <code>iCCP</code> chunk
    will be read or written and no <code>sRGB</code> chunk will be
    written.  There are some ICC profiles that claim to be sRGB but
    have various errors that cause them to be rejected by libpng16; such
    profiles are recognized anyhow and converted to the <code>sRGB</code>
    chunk, but are rejected if the <code>-define png:preserve-iCCP</code>
    is present. Note that not all "sRGB" ICC profiles are recognized
    yet; we will add them to the list as we encounter them.</td>
  </tr>

  <tr>
    <td>png:swap-bytes[=<var>true</var>]</td>
     <td>The PNG specification requires that any multi-byte integers be stored 
    in network byte order (MSB-LSB endian).  This option allows you to
    fix any invalid PNG files that have 16-bit samples stored incorrectly
    in little-endian order (LSB-MSB).  The "-define png:swap-bytes" option
    must appear before the input filename on the commandline.  The swapping
    is done during the libpng decoding operation.</td>
  </tr>

  <tr>
    <td>ps:imagemask</td>
     <td>If the ps:imagemask flag is defined, the PS3 and EPS3 coders will
    create Postscript files that render bilevel images with the Postscript
    imagemask operator instead of the image operator.</td>
  </tr>

  <tr>
    <td>psd:additional-info=all|selective</td>
     <td>This option should only be used when converting from a PSD file to
     another PSD file. This should be placed after the image is read. The two
     options are 'all' and 'selective'. The 'selective' option will preserve
     all additional information that is not related to the geometry of the
     image. The 'all' option should only be used when the geometry of the
     image has not been changed. This option is helpful when transferring
     non-simple layers, such as adjustment layers from the input PSD file to
     the output PSD file. If this option is not used, the additional
     information will not be preserved. This define is available as of
     Imagemagick version 6.9.5-8.
    </td>
  </tr>

  <tr>
    <td>psd:alpha-unblend=off</td>
     <td>Disables new automatic un-blending of transparency with the base image
     for the flattened layer 0 before adding the alpha channel to the output
     image. This define must be placed before the input psd image. (Available
     as of IM 6.9.2.5). The automatic un-blending is new to IM 6.9.2.5 and
     prevents the transparency from being applied twice in the output
     image. This option should be set before reading the image.</td>
  </tr>

  <tr>
    <td>psd:preserve-opacity-mask=<var>true</var></td>
     <td>This option should only be used when converting from a PSD file to
     another PSD file. It will preserve the opacity mask of a layer and add it
     back to the layer when the image is saved. Setting this to 'true' will
     enable this feature. This define is available as of Imagemagick version
     6.9.5-10.
    </td>
  </tr>

  <tr>
    <td>svg:xml-parse-huge=<var>true</var></td>
    <td>Enables rendering of a very large SVG for which you trust the source</td>
  </tr>

  <tr>
    <td>tiff:alpha=<var>associated|unassociated|unspecified</var></td>
    <td>Specify the alpha extra samples as associated, unassociated or
    unspecified.</td>
  </tr>

  <tr>
    <td>tiff:endian=<var>msb|lsb</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>tiff:exif-properties=<var>true</var></td>
    <td>Enables reading the EXIF properties.</td>
  </tr>

  <tr>
    <td>tiff:fill-order=<var>msb|lsb</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>tiff:ignore-layers=<var>true</var></td>
    <td>Ignores the photoshop layers.</td>
  </tr>

  <tr>
    <td>tiff:ignore-tags=<var>comma-separate-list-of-tag-IDs</var></td>
    <td>Allows one or more tag ID values to be ignored.</td>
  </tr>

  <tr>
    <td>tiff:predictor=<var>[1, 2 or 3]</var></td>
    <td>A mathematical operator that is applied to the image data before an 
    encoding scheme is applied. The general idea is that subsequent pixels of 
    an image resemble each other. Thus, substracting the information from a 
    pixel that is already contained in previous one is likely to reduce its 
    information density considerably and aid subsequent compression. 
    1 = No prediction scheme used before coding. 2 = Horizontal differencing. 
    3 = Floating point horizontal differencing.</td>
  </tr>

  <tr>
    <td>tiff:rows-per-strip=<var>value</var></td>
    <td>Sets the number of rows per strip.</td>
  </tr>

  <tr>
    <td>tiff:tile-geometry=<var>WxH</var></td>
    <td>Sets the tile size for pyramid tiffs. Requires the suffix
        PTIF: before the outputname.</td>
  </tr>

  <tr>
   <td colspan=2><p></p></td>
  </tr>

  <tr>
   <td colspan=2><p></p></td>
  </tr>

  <tr>
    <th align="center" colspan=2>PSEUDO-IMAGE FORMATS</th>
  </tr>

  <tr>
    <td>caption:max-pointsize=<var>pointsize</var></td>
     <td>Limits the maximum point size</td>
  </tr>

   <tr>
    <td>gradient:angle=<var>angle (in degrees)</var></td>
     <td>For a linear gradient, this specifies the direction of 
     the gradient going from color1 to color2 in a clockwise 
     positive manner relative to north (up). For a radial 
     gradient, this specifies the rotation of the gradient in a 
     clockwise positive manner from its normal X-Y orientation.
      Supported in Imagemagick 6.9.2-5.</td>
   </tr>

   <tr>
   	 <td>gradient:bounding-box=<var>WxH+X+Y</var></td>
     <td>Limits the gradient to a larger or smaller region than 
     the image dimensions. If the region defined by the bounding 
     box is smaller than the image, then color1 will be the color 
     of the background.
      Supported in Imagemagick 6.9.2-5.</td>
   </tr>

   <tr>
    <td>gradient:center=<var>x,y</var></td>
     <td>Specifies the coordinates of the center point for the 
     radial gradient. The default is the center of the image.
      Supported in Imagemagick 6.9.2-5.</td>
   </tr>

    <tr>
    <td>gradient:direction=<var>value</var></td>
     <td>Specifies the direction of the linear gradient towards 
     the top/bottom/left/right or diagonal corners. The choices are: 
     NorthWest, North, Northeast, West, East, SouthWest, South, SouthEast.
      Supported in Imagemagick 6.9.2-5.</td>
   </tr>

     <tr>
    <td>gradient:extent=<var>value</var></td>
     <td>Specifies the shape of an image centered radial gradient. 
     The choices are: Circle, Diagonal, Ellipse, Maximum, Minimum.
     Circle and Maximum draw a circular radial gradient even for 
     rectangular shaped images of radius equal to the larger of 
     the half-width and half-height of the image. The Circle and 
     Maximum options are both equivalent to the default radial 
     gradient. The Minimum option draws a circular radial gradient 
     even for rectangular shaped images of radius equal to the 
     smaller of the half-width and half-height of the image. 
     The Diagonal option draws a circular radial gradient even 
     for rectangular shaped images of radius equal to the 
     half-diagonal of the image. The Ellipse options draws an 
     elliptical radial gradient for rectangular shaped images of  
     radii equal to half the width and half the height of the image.
      Supported in Imagemagick 6.9.2-5.</td>
   </tr>

 <tr>
    <td>gradient:radii=<var>x,y</var></td>
     <td>Specifies the x and y radii of the gradient. If the 
     x radius and the y radius are equal, the shape of the 
     radial gradient will be a circle. If they differ, then 
     the shape will be an ellipse. The default values are the 
     maximum of the half width and half height of the image.
      Supported in Imagemagick 6.9.2-5.</td>
   </tr>

   <tr>
    <td>gradient:vector=<var>x1,y1,x2,y2</var></td>
     <td>Specifies the direction of the linear gradient going from 
     vector1 (x1,y1) to vector2 (x2,y2). Color1 (fromColor) will be 
     located at vector position x1,y1 and color2 (toColor) will be 
     located at vector position x2,y2.
      Supported in Imagemagick 6.9.2-5.</td>
   </tr>

  <tr>
    <td>histogram:unique-colors=<var>false</var></td>
     <td>Suppresses the textual listing of the image's unique colors.</td>
   </tr>

  <tr>
    <td>pango:align=<var>left|center|right</var></td>
     <td></td>
   </tr>

  <tr>
    <td>pango:auto-dir=<var>true|false</var></td>
     <td></td>
   </tr>

  <tr>
    <td>pango:ellipsize=<var>start|middle|end</var></td>
     <td></td>
   </tr>

  <tr>
    <td>pango:gravity-hint=<var>natural|strong|line</var></td>
     <td></td>
   </tr>

  <tr>
    <td>pango:hinting=<var>none|auto|full</var></td>
     <td></td>
   </tr>

  <tr>
    <td>pango:indent=<var>points</var></td>
     <td></td>
   </tr>

   <tr>
    <td>pango:justify=<var>true|false</var></td>
     <td></td>
   </tr>

   <tr>
    <td>pango:language=<var>en_US|others</var></td>
     <td></td>
   </tr>

   <tr>
    <td>pango:markup=<var>true|false</var></td>
     <td></td>
   </tr>

   <tr>
    <td>pango:single-paragraph=<var>true|false</var></td>
     <td></td>
   </tr>

  <tr>
    <td>pango:wrap=<var>word|char|word-char</var></td>
     <td></td>
   </tr>

   <tr>
    <td>pixel:compliance=<var>value</var></td>
     <td>Sets the "pixel:" output format according to several standards.
     The choices are svg, none, undefined, mvg, x11, xpm. The default will 
     list values for (s)RGB colors in the form of (s)rgb(r,g,b) or 
     (s)rgba(r,g,b,a). Color names will no longer be presented. For sRGB or 
     RGB colors, the svg, x11, xpm and none options will list color names, 
     if they exist. The mvg and undefined options will list hex values. When 
     colors are presented or converted to hue-based colorspaces, the values 
     listed will be integers for hue and percents for the other two components. 
     For other colorspaces, values may be listed as either percents or 
     fractional value. Setting the depth to 8 will limit values to the 8-bit 
     range, except for hue-based colors.</td>
   </tr>

    <tr>
    <td>txt:compliance=<var>value</var></td>
     <td>Sets the "txt:" format for the values in parentheses according to 
     several standards. The choices are svg, none, undefined, mvg, x11, xpm.
     The default will list values for (s)RGB colors in the quantum range.
     The svg, x11, xpm, mvg and none options will list values in the 8-bit range 
     for all Q-level compiles. The undefined option also lists values in the 
     quantum range. When colors are presented or converted to hue-based 
     colorspaces, the values listed will be integers for hue and percents for 
     the other two components. For other colorspaces, values may be listed as 
     either percents or fractional value. Setting the depth to 8 will limit 
     values to the 8-bit range, except for hue-based colors.</td>
   </tr>

<tr>
   <td colspan=2><p></p></td>
  </tr>

   <tr>
   <td colspan=2><p></p></td>
  </tr>

  <tr>
    <th align="center" colspan=2>Identify Defines</th>
  </tr>

  <tr>
   <td colspan=2><p></p></td>
  </tr>

  <tr>
    <td>identify:locate=<var>minimum|maximum</var></td>
     <td>Locates the coordinates of one or more image minimum or maximum.</td>
  </tr>

  <tr>
    <td>identify:limit=<var>number</var></td>
     <td>Locates the coordinates for the number of minima or maxima specified.</td>
  </tr>

</table>

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